SUBJECTS OF CHAPTERS CHAPTER I. Historical Account 1 CHAPTER II. Practical Introduction of the Screw Propeller 86 CHAPTER III. Scientific Principles concerned in the Operation of Screw Vessels 97 CHAPTER IV. Comparative Efficiency of the Screw and Paddle as a Propeller 116 CHAPTER V. Comparative Merits of Screws of different Kinds 134 CHAPTER VI. Screw Vessels with full Power 173 CHAPTER VII. Screw Vessels with auxiliary Power 184 CHAPTER VIII. Screw Steam Vessels on Canals 198 CHAPTER IX. Comparison of different Kinds of Screw Engines 203 CHAPTER X. Details of the Construction of Screw Engines and Ships 220 CHAPTER XI. The Screw and Paddles combined 231 CHAPTER XII. Recapitulation op Doctrines and Conclusions 240 APPENDIX. Dimensions of Screw Steam Vessels in Her Majesty's Navy i Performance of Screw Steam Vessels in Her Majesty's Navy ii Explanation of Tables of Dimensions and Performance of Screw Vessels iv Results of Experiments made with French Screw Steamer "Pelican" v Account of the Performance of United States Screw War Steamer "San Jacinto" xxii Screw and Paddle Vessels on the Atlantic xxvi Comparison of the "San Jacinto" and "Saranac" xxviii Feathering Screws xxix On the Introduction and progressive Increase of Screw Propulsion in Her Majesty's Navy xxxi Wooden and Iron Steamers xxxiii Specification of the Auxiliary Screw Steamer "Water Witch" xxxix LIST OF PLATES I. Dynamometer Diagrams taken in the "Rattler." II. Indicator Diagrams taken during the Experiments between the "Rattler" and "Alecto." III. Engines of H. M. Screw Steam Yacht "Fairy" and French Mail Screw Steam Packet "Faon." IV. Engines of H. M. Screw Steam Packet "Plumper." V. Engines and Boilers of Screw Steam Ship "Great Britain." VI. Engines of the Screw Steam Yacht "Fire Queen." VII. Engines of the Screw Steam Yacht "Fire Queen." VIII. Engines of the Screw Steam Ships "City of Glasgow," "City of Manchester," and "Glasgow." IX. Engines of the Auxiliary Screw Steam Vessel "Correo." X. Engines and Details of the American War Steamer "Princeton." XI. French Screw Steam Frigate "Pomone" of 46 guns. XII. Engines of H. M. Screw Steam Ship "Amphion." XIII. Sections, Plan and Engines of H. M. Screw Steamer "Wasp." XIV. Vertical and horizontal Sections of H. M. Screw Steam Ship "Ajax." XV. Lines of H, M. Screw Steam Yacht "Fairy," and of the French Mail Screw Steam Packet "Faon." XVI. Lines of Screw Steam Yacht "Fire Queen" and French Screw Steam Packets "Biche" and "Sentinelle." XVII. Lines of the Screw Steamers "European" and "Frankfort." XVIII. Lines of the Screw Steamers "Rattler" and "Great Britain." XIX. Comparative View of geared Screw Engines. XX. Comparative View of direct acting Screw Engines.